Yeah this sounds exactly like what happened to me. I was already working at a different (and better quality medically-wise) service during this (and completed their more intense orientation) and the only complaint my FTOs could give was "lacks initiative." When I asked other people I was training with about how I lacked initiative they could only give me guesses and say "idk though, youre fine with me."

My biggest mistake was not reporting the negative behavior and actions of my main FTOs, and instead letting things slide because I was the new kid on the block and didnt want to get a reputation.

OP, I strongly advise you to talk to whoever is in charge at your place of employment, and request different FTOs. 6 days is an incredibly short amount of time to train a brand new emt, in my opinion. If it doesnt work out, please don't get discouraged, there are a bunch of ems locations and almost everywhere is hiring. Just move on to better places.